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(parent: 09cbd38) | patch
phy: sun4i-usb: Do not drive VBUS with external VBUS present
authorSamuel Holland <samuel@sholland.org>
Fri, 15 Jul 2022 03:34:53 +0000 (22:34 -0500)
committerAndre Przywara <andre.przywara@arm.com>
Fri, 28 Apr 2023 00:30:40 +0000 (01:30 +0100)
commitdf202d996d72665c76d031849aa064c4881dc777
tree910e69df6f0774bfc5cd53bd29b84024ee1c54eetree | snapshot
parent09cbd3858f156e0461c0c939f23cf3c76ef95dcccommit | diff
phy: sun4i-usb: Do not drive VBUS with external VBUS present

It is possible to use host-side USB with externally-provided VBUS. For
example, some USB OTG cables have an extra power input which powers
both the board and the USB peripheral.

To support this setup, skip enabling the VBUS switch/regulator if VBUS
voltage is already present. This behavior matches the Linux PHY driver.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
drivers/phy/allwinner/phy-sun4i-usb.c diff | blob | history
Domain: System / Kernel;